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Article #20498

X-10 three-way switch

#20498
From: Alan Wm Paeth
Date: Wed, 25 Jan 1989 19:46
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I have a three-way switch (Radio Shack) that comes with a companion switch;
I need it wire the master as a conventional (2-way) switch for use without the
companion.  Presumably, I just need to add a resistor across the two (SP)DT
output legs of the master (to allow current to flow to power the switch)? I'd
like a UL approved sort of answer before I fool with this (eg "use the blue
wire", not "play with it until it works").

It is a mystery to me why these switches even require a double output rail;
a single rail design (SPST with shunt resistor) should work, as the previous
X-10 lamp controllers I've seen will toggle state in the presence of switch
action. This would also allow n-switch (to the limit of the summed series
resistance) without the additional "4-way" DPDT complexity normally associated
with extending 3-way lights for control at >=3 stations. Would make wiring
simplier, too, though not back compatible.

    /Alan Paeth
    Computer Graphics Laboratory
    University of Waterloo
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Message-ID: <7831@watcgl.waterloo.edu>
Path: arc1-ca.pugleaf.net!utzoo!utgpu!watmath!watcgl!awpaeth

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!watmath!watcgl!awpaeth
From: awpaeth@watcgl.waterloo.edu (Alan Wm Paeth)
Newsgroups: sci.electronics
Subject: X-10 three-way switch
Message-ID: <7831@watcgl.waterloo.edu>
Date: 25 Jan 89 19:46:07 GMT
Distribution: sci
Organization: U of Waterloo, Ontario
Lines: 18